A 368 × 184 Optical Under-Display Fingerprint Sensor With Global Shutter and High-Dynamic-Range Operation

Yin, Peng; Lu, Chih-Wen; Wang, Jia-Shyang; Chang, Keng-Li; Lin, Fu-Kuo; Chang, Chia-Jung; Gen-Chiuan, Bai

doi:10.1109/cicc48029.2020.9075898

Cited by 4 publications

(1 citation statement)

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“…Our main objective is to demonstrate that we can significantly improve the conditioning of lensless imaging systems and the quality of the reconstruction by using coded illumination. The proposed framework can be used to build high-resolution, compact underthe-display fingerprint sensors/cameras that can use display panels for coded illumination [44,46,47]. Lensless microscopes [1,2,14] can also benefit by combining coded illumination with data capture.…”

Section: Introductionmentioning

confidence: 99%

Coded Illumination and Multiplexing for Lensless Imaging

Zheng

Zhang

Asif

2020

ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Mask-based lensless cameras can be flat, thin and lightweight, which makes them suitable for novel designs of computational imaging systems with large surface areas and arbitrary shapes. Despite recent progress in lensless cameras, the quality of images recovered from the lensless cameras is often poor due to the ill-conditioning of the underlying measurement system. In this paper, we propose to use coded illumination to improve the quality of images reconstructed with lensless cameras. In our imaging model, the scene/object is illuminated by multiple coded illumination patterns as the lensless camera records sensor measurements. We designed and tested a number of illumination patterns and observed that shifting dots (and related orthogonal) patterns provide the best overall performance. We propose a fast and low-complexity recovery algorithm that exploits the separability and block-diagonal structure in our system. We present simulation results and hardware experiment results to demonstrate that our proposed method can significantly improve the reconstruction quality.

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